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c++cfunctioncalling-convention

Pass the current state of a function into another function in C/C++

Is there a way to pass the current state of a function into another function in C/C++? I mean all the parameters and local variables by current state. For example:

void funcA (int a, int b)
{
    char c;
    int d, e;
    // Do something with the variables.
    // ...
    funcB();
    // Do something more.
}

void funcB()
{
    // funcB() should be able to access variables a,b,c,d & e
    // and any change in these variables reflect into funcA().
}

The code is in bad shape if there is a need for funcB() kind of functions. But can it be achieved?

This can help if someone is starting to re-factor a long method with multiple parameters.

Solution

  • Introduce a common struct.

    struct State {
    char c;
    int d,e;
};

void funcA(int a, int b){
    State s;
    s.d = 1234; // ...
    // ...
    funcB(s);
}

void funcB(State& s)
{
    //...
}